Questions tagged [summing]

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How to LPF only one of the inputs to a voltage adder?

I'm taking voltages from two inputs, and I'd like to add them together using an op amp (this is actually a summing integrator). I would like to filter out the noise in V_DAC (which will not change ...
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0 votes
1 answer
38 views

Buffer with parallel capacitors

Hello I am trying to build the following 3 band equalizer for a project. As I am analyzing the circuit I've come to a problem. I do understand what the "second stage" does: It's a summing ...
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2 answers
96 views

Design Methodology for Non-Inverting Summing Amp

I'm trying to design an op-amp circuit to sum up four voltages by using a non-inverting summing configuration. You can see it in the circuit below, though for illustration's sake, the resistor values ...
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0 votes
2 answers
252 views

Where to add equalization in active audio mixer?

I want a 2-input summing amplifier where I can adjust the amount of signal from each source with a single potentiometer. I intend to hook up two microphones (Shure SM57 and Audio Technica ATR 1500, ...
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0 votes
1 answer
125 views

Is there a simple fix for summing 2 AC signals?

I have seen many mixer schematics. They are pretty much always the same - a stack of resistors. Even some DJ mixers using the SSM2164 simply joined outputs followed by an opamp. The same thing always ...
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2 votes
1 answer
72 views

Multiple LM35 temperature sensors with summing amplifier?

I have two big heatsinks with four power MOSFETs on each of them, I want to control the temperature of each heatsinks so that doesn't exceed 80℃ using two LM35 temperature sensors: simulate this ...
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3 answers
105 views

Floating/open input on summing amp

I was tasked with taking a signal that could be of ±2.5 and converting it to 0-5v so it could be read by an ADC. I managed that with a non-inverting summing amp like so: It worked pretty well but I ...
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0 votes
1 answer
181 views

Stereo channel strip based on NE5532

I want to build a stereo channel strip, using the NE5532 IC. It should feature 2 mono inputs with volume control, mute switch and pan control going to a stereo output with unity gain. In the schematic ...
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1 vote
1 answer
84 views

FFT analysis of summed signal in LTSpice

I know that simulating FFT analysis of current/voltage across a single element via LTSpice is quite straightforward. I have simulated the summation of three distinct currents in the time domain. I'd ...
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2 answers
94 views

How do I create a 1-bit full adder that outputs a 2-bit sum?

I am trying to build a 1-bit full adder that outputs a 2-bit sum. I know that the standard 1-bit FA outputs a 1-bit sum and a carry bit, but I was wondering how can I modify the FA such that the carry ...
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1 vote
1 answer
78 views

Summing stereo and mono channels passively

I am trying to build a headset for use on my motorcycle which will allow me to listen to my music from my phone (stereo signal) and the incoming sound from my UHF radio (mono i'm pretty sure). what is ...
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1 vote
1 answer
123 views

3-to-2 line encoder (or generally 2^(n-1)-to-n) -- not priority, but telling how many inputs are on?

This is not homework (not taking any classes) although it could be homework. I am wondering what is the easiest implementation using a single TTL chip or gates (fewest chip count) to encode the number ...
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3 answers
300 views

Summing Integrator cut off

I would like to know how to calculate cut off frequency of this summing integrator circuit. I fail to find anywhere on the internet how to calculate cut off frequency in this configuration. Then how ...
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0 votes
1 answer
5k views

How do you combine 2 AC power sources?

To combine 2 DC power sources, you can diode OR them both together. You can't just directly connect them together because their voltage outputs may differ ever-so-slightly, leading to imbalanced ...
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1 vote
3 answers
491 views

Is there a limit to the number of inputs that can be summed with an op-amp summing circuit?

I'm interested in the limits you encounter if you try to add many inputs into an op amp summing circuit. I've read that the inverting configuration is more natural for adding many inputs since the ...
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2 votes
0 answers
48 views

Summing Audio Channels

I’m trying to sum my car stereo output. Factory output has bass on one output and mid and tweeter on another output giving me 2 channels for left and 2 channels for right. Ideally I’d like to sum ...
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0 votes
1 answer
113 views

Why is my mixer circuit lowering the signal?

I have made a really simple mixer, to be used with both audio and control signals in a modular system: This should if I understand it correctly give "about" 1:1 (1:0.99 in simulation) ratio beetween ...
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0 votes
1 answer
89 views

Voltage level shifter using opamp

I am making a circuit to acquire EOG signals and read it via the analog pin of Arduino. The arduino reads only positive signals, which is why I am unable to see the negative spikes in voltages caused ...
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0 votes
2 answers
214 views

Noise on stereo summing circuit from LED's

I've been a tinkerer and hobbyist for 20 years now, but mostly in software. I've done my fair share of simple soldering (replaced controller ports on an original Xbox with actual USB ports, for ...
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  • 101
2 votes
4 answers
1k views

Non-inverting Op-Amp Audio Mixer

I am trying to make sense of the difference in non-inverting and inverting op-amp based audio "mixers". The circuits are basically summing op-amp amplifiers. Here is the part which I do not understand....
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0 votes
0 answers
38 views

Help in analysing circuit to show which resistor controls the differential gain

I understand the circuit to be a summing circuit but I am struggling to analyse past this point: Vout = R5 (((-R2/R1 * V2)/R4) * (V1 / R3)). can anyone analyse this further to prove that R5 is the ...
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0 votes
2 answers
59 views

Help with my design: How can I add these voltages?

I have to design a circuit that simulates a voltage spike on a dc supply rail. The circuit has a button that, when pressed, generates a short pulse of controllable height (controlled by pot). The ...
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  • 101
6 votes
4 answers
4k views

How do solar inverter systems easily add AC power sources together? [closed]

I understand DC power more than AC power. I know that given multiple DC power generators, easiest way to sum them is by connecting them in series. In paralel you'd need every generator circuit to ...
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4 votes
3 answers
952 views

Don't individual signal sources affect each other when using a summing amplifier?

I am studying the book Electric Circuits by Nilsson & Riedel. There I learned about "summing amplifiers" and how to derive equations by applying KCL at inverting input of the op amp. I see that ...
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0 votes
1 answer
158 views

summing amp - floating inputs

I'm designing an audio mixer and currently i'm working on a cue section. The whole point is that i have 2 or more channels and want to mix them in summing mixer. You can turn off the channels you don'...
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1 answer
205 views

Practical considerations for a summing amplifier

The summing (usually inverting) amplifier is a classic op amp configuration. However, I'm struggling to find any products on the market which actually do this, leading me to conclude that I have to ...
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1 answer
406 views

Adding multiple differential signal

As I asked in "Adding multiple analog signal" before, I got that: for adding some signal together, we can only use op-amp, instead of lovely integrated circuit (ough). But the question arise because ...
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2 votes
3 answers
576 views

Mathematically derived waveform vs. captured waveform from an analog synthesizer

I was thinking about how the individual parameters on an analog synthesizer could be controlled digitally. What I mean is, instead of using mechanical potentiometers to adjust some quality of the ...
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0 votes
2 answers
301 views

Adding large numbers in context of analog computing?

I have been reading about analog computing yet have not been able to find material about a certain issue; in reference to arithmetic, it is said that op-amps are used to perform these tasks, for ...
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0 votes
3 answers
709 views

Connecting signal to multiple summing amplifiers

For a normal op-amp inverting summing amplifier, each signal is tied to the negative input of the op-amp. Imagine the scenario where I have three signals. In adder 1, I want to sum A and B. In adder 2,...
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1 vote
1 answer
188 views

Instrumentational Amplifier with Summing Amplifier

As you all know, most Inst. Amp. examples on the Internet have a 'Differential Amplifier' part as shown below. But, what would happen if a summing amplifier was used instead ? What kind of ...
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0 votes
0 answers
67 views

Summing Configuration Question

I'm building the following circuit in a PCB . The purpose is simple, the first stage is a TIA amplifier that converts current into voltage and its working fine. The second stage, where the problem is ...
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0 votes
1 answer
186 views

LTSpice simulation errors?

I ran this simulation in ltspice and my output voltage was -2.97V. According to my calculations I should have roughly -10V when all sources are at 5V. $$V_{out} = -V_{in}R_5 \left ( \frac{1}{R_1} + \...
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13 votes
3 answers
5k views

Accidentally downmixed stereo to mono, why does this work?

I have a cheap Chinese Bluetooth audio amplifier like this: It has four screw terminals for the speaker connections, namely L+, L-, R+ and R-. I accidentally connected a single speaker to L+ and R-, ...
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2 votes
1 answer
751 views

What's the best way to mute summed stereo channels?

I am building an audio mixer, and most of the instruments produce mono signals (internally split to L/R), but want to make sure it is flexible enough to use true stereo devices, and sum to mono in my ...
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  • 359
1 vote
3 answers
496 views

How can I add high and low voltage signals to a high voltage DC offset?

It's only a theorethical question, since I'm not really going to build this circuit... I'm just curious, that's all. Anyway, thats my question! I have these signals: 3 kHz, 1V (peak) 20 Hz, ...
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0 votes
3 answers
409 views

Eliminating attenuation in summing box

Full disclosure: when it comes to electronics, I'm the type that knows enough to be dangerous. And that's kinda why I'm here - I took an electronics course in high school in 2005, but it's been a ...
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1 vote
1 answer
51 views

Does a Series Voltage Reference referencing more than one electrical block has to be buffered?

I'm planing to use a Series Voltage Reference,REF3330, as a voltage reference to three distinct parts of my circuit and i need an opinion regarding the way how to do it. First of all, the reference ...
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0 votes
2 answers
900 views

Can I use a Class D amplifier as a summing amplifier?

Context: I'm creating a mono, battery powered speaker. I'd like to sum the left and right channels of a stereo input signal into a mono output signal, which I feed into a Class-D Mono Audio Amplifier ...
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0 votes
1 answer
485 views

Summing amplifier with one op amp

I want to design amplifier that do the following summation $$V_o = 2V_1 +3V_2 +5V_3 $$ the difficult arose when design with one op-amp and all voltages are referenced to the ground . I tried with ...
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0 votes
1 answer
172 views

When to treat transformers as non-ideal?

For an experiment I need to sum a DC and AC Potential. My solution to this was to construct the following circuit: simulate this circuit – Schematic created using CircuitLab Testing this ...
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8 votes
3 answers
21k views

Inverting summing amplifier vs Non-inverting summing amplfier

As known there are inverting and non-inverting summing circuits, such as below: What's their cons and pros?
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  • 5,638
0 votes
3 answers
2k views

Producing the Sum and Difference of two signals with two Op-Amps

I have two signals, one is a baseline voltage (V1) and the other is a 'difference' voltage (V2). From these I want to produce two signals, V1 + V2 and V1 - V2. The circuit I currently have is: ...
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0 votes
1 answer
1k views

Multisim and DAC (summing op amp)

I am using multisim to simulate an inverting summing op amp (LM741CN). I calculate my expected Vout to be the following: -Vout = ((20/2.5)V1) + ((20/5)V2) + ((20/10)V3) + ((20/20)V4). According to my ...
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0 votes
1 answer
714 views

How to measure the input impedance of a summing amplifier?

I have a summing amplifier set up like so, and I need to come up with a test to find the input impedance, I know because its a 741 IC that it will be in the region of 250k - 10 mil ohms, but don't ...
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3 votes
2 answers
460 views

Antenna sector power ratio (total power)

This is maybe a very basic question, which is driving me insane, because I can't remember the theory and neither I can seem to find any source about the topic. I have an antenna, whose SPR (sector ...
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4 votes
0 answers
423 views

Floating point addition. Are guard, round and sticky bit always necessaryl? analysis of a special case

I've a particular case of floating point addition. As you know for given floating point numbers \$x,y\$ one of the steps of the addition involves the fixed point sum: $$ s = 1.m_x + (-1)^{s_x \oplus ...
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0 votes
1 answer
567 views

Positive Feedback Of A Summing Amplifier

I've recently come across a topic that has not been covered in my studies (or at least not as yet). It's positive feedback of an amplifier. I have been reading this link on positive feedback. From ...
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0 votes
3 answers
603 views

Find v1 and v2 of a summing amplifier when it is in series with another Op-Amp

There is a summing amplifier with two AC power sources (v1+v2,) each connected to a different Ground. Each of these sources connect to a resistor (R1+R2,) and then to a summing point, which branches ...
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-5 votes
1 answer
3k views

Why the op-amp is clipping the output signal even it is under the supply voltage? [closed]

I am just trying to build a mixer circuit to change stereo to mono using a summing circuit for a project. simulate this circuit – Schematic created using CircuitLab As shown by the drawing, I ...
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